Solutions
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kalpat's post in Loose plug behind front grill? was marked as the answerIt looks like the temperature sensor. There should be a small metal plate nearby with a hole in it. The sensor has plastic lugs which snap into place when you push it into the hole. The one on my Octy 2 used to fall out, but the plastic clips can break & it doesn't stay in place. I fastened it with a plastic tie strap.